Two widefields from last night

supernova1965 (Warren) · #1 21-08-2011, 10:15 AM

Our local group went to our closer viewing spot and I got these two widefield shots the milkyway one seems to have stretched stars around the edges that I don't understand as I haven't had this happen with this lens before. Any ideas why

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The Milkyway one is at 800 iso and 15 sec 47 subs stacked in DSS and 30 darks.

The Crux one is 1600 at 15 sec and 35 subs in DSS with the same darks both with the same lens at 18mm

supernova1965 (Warren) · #2 21-08-2011, 11:30 AM

Another one that had a plane go through so I threw it out of the crux one but I stacked the three images because I thought it would look good.

rcheshire (Rowland) · #3 21-08-2011, 12:20 PM

Hi Warren. I have seen the same with aperture wide open - is it coma?. Stopping down helps, but that increases exposure time.

jjjnettie (Jeanette) · #4 21-08-2011, 02:39 PM

Quote:

Originally Posted by rcheshire

Hi Warren. I have seen the same with aperture wide open - is it coma?. Stopping down helps, but that increases exposure time.

Agreed. Stopping down the lens to F5.6 or maybe more will tighten up your stars and keep the coma to a minimum.
A little more attention to focus is needed too.
But the colours are great.

So when are you going to have a go at taking star trails???

supernova1965 (Warren) · #5 21-08-2011, 02:42 PM

Startrails I have been dabbling in them but nothing I am willing to post yet but soon I think

multiweb (Marc) · #6 21-08-2011, 02:47 PM

Both shots with tree lines are excellent Warren. The milkyway one's slightly out of focus. In all, good stuff.

jjjnettie (Jeanette) · #7 21-08-2011, 02:56 PM

Warren, have you downloaded the Star Trails software yet?
I had a dabble with it last night and was suitably impressed by how easy it was to use.

supernova1965 (Warren) · #8 21-08-2011, 03:00 PM

No but I will now thanks for the tip JJJ